just add 568+400 to get 868 then take away one because you added to many and you will get 867. you get 967
I rounded 386 to 390. Then i rounded 297 to 300. Next I added 390 and 300 and got 690. then you subtract 7 from 690 and get 683
just do 546+400 to get 946 then take away one to get 945.=)
you add 748+200 and get 948 and then - 2 and you get 946
Change 395 to 400 and 427 to 430 and when you and them up you get 830. subtract 35 and then you get 795.
Round 799 to 800 then + 865 =1665 after that -1 and get 1664
just round 497 to 500 then add 500 + 786 to get 1268. Then subtract 3 to get 1265.. :)
345
-298
568
-399
386
-297
546
-399
748
-198
427
-395
865
-799
768
-497
round 298 to 300 and 345-300=45 but add 2 so you get 47 for your answer!
568-399 is the same as 569-400. the answer is 169 both ways.
Just do 386-300+3 it equals,,,89 =)
Do 768-500 to get 268
then add 3 because you
took away too many to
get 271. There's your answer!=)
Change the problem to make it easier to multiply. For example, you can multiply one number by two
if you multiply the other by 1/2. Try making your own and solving it in the top row.
16
x 5
28
x 5
24
x 5
148
x 5
248
x 50
128
x 50
468
x 500
Multiply by Splitting
When one number of a multiplication pair has two digits, try splitting that number into two parts by dividing it by 2.
Example: 9 x 12
Split 12 into two parts: 12=6x2
Instead of 9x12 (9x6x2) think 9 x 6 and then double it.
9x6=54 Double 54 and you get 108.
1. 8 x 16 multiply 8 x 8 x 2 because 8 x 2 is 16 x 8 so the answer is 128.
2. 5 x 22 multiply 5 x4=20 + 2 =22 because 5x22 =220 you just + a 0
3. 6 x 18 18= 9 x 2 so you have to do 6 x 9 to get 54 x 2 to get 108.
4. 7 x 14 14= 7 x 2 so you have to do 7 x 7 to get 49 then 49 x 2 to get 98. =-)
345
+298
568
+399
386
+297
546
+399
748
+198
427
+395
865
+799
768
+497
give 2 to 298 make it 300
and then dd 300+345 and
get 645 then take 2 off and
get 643.
you get 967
then you subtract 7 from 690 and get 683
345
-298
568
-399
386
-297
546
-399
748
-198
427
-395
865
-799
768
-497
then add 3 because you
took away too many to
get 271. There's your answer!=)
Change the problem to make it easier to multiply. For example, you can multiply one number by two
if you multiply the other by 1/2. Try making your own and solving it in the top row.
16
x 5
28
x 5
24
x 5
148
x 5
248
x 50
128
x 50
468
x 500
Multiply by Splitting
When one number of a multiplication pair has two digits, try splitting that number into two parts by dividing it by 2.
Example: 9 x 12
Split 12 into two parts: 12=6x2
Instead of 9x12 (9x6x2) think 9 x 6 and then double it.
9x6=54 Double 54 and you get 108.
1. 8 x 16 multiply 8 x 8 x 2 because 8 x 2 is 16 x 8 so the answer is 128.
2. 5 x 22 multiply 5 x4=20 + 2 =22 because 5x22 =220 you just + a 0
3. 6 x 18 18= 9 x 2 so you have to do 6 x 9 to get 54 x 2 to get 108.
4. 7 x 14 14= 7 x 2 so you have to do 7 x 7 to get 49 then 49 x 2 to get 98. =-)
5. 9 x 16 16= 8 x 2 so 9 x 8 is 72 x 2 is 144.=-)
6. 12 x 24 24= 12x 2 so 12x12=144x2=288....XD